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WorksheetsEDJ27203 Quiz 1 Set 2
Total questions: 17
Worksheet time: 29mins
Name
Class
Date
1.
What does the term measurand refer to in measurement science?
a)
The process of using instruments to obtain data
b)
The quantity intended to be measured
c)
The unit chosen to represent a quantity
d)
The numerical result obtained after measurement
2.
A device that converts temperature into an electrical signal is an example of what?
a)
An amplifier
b)
A resistor
c)
A transducer
d)
A power supply
3.
An error in a measurement system that consistently reads higher than the true value, regardless of the reading, is known as what?
a)
Gross error
b)
Environmental error
c)
Random error
d)
Systematic error
4.
A student measures the length of a rod, and the average of the readings is 25.3 cm. If the true length is 25.2 cm, what is the systematic error?
a)
0.033 cm
b)
0.1 mm
c)
25.2 cm
d)
0.1cm
5.
An experiment's true value for voltage is 5.0 V. A set of measurements yields readings of 5.05 V, 5.00 V, 5.15 V, and 5.05 V. What is the random error for this data set?
a)
0.0875 V
b)
5.0625 V
c)
0.0625 V
d)
0.1 V
6.
Why is it crucial to achieve high accuracy and precision in measurement?
a)
To make instruments look more professional
b)
To ensure results are reproducible and close to the true value
c)
To increase the cost of the measurement process
d)
To speed up the time it takes to get a reading
7.
A lab technician weighs a chemical compound four times and gets the following values: 5.01 g, 5.00 g, 4.99 g, 5.00 g. The true mass is 5.20 g. How would you describe the results?
a)
Both accurate and precise
b)
Neither accurate nor precise
c)
Precise but not accurate
d)
Accurate but not precise
8.
Accuracy in a measurement refers to the instrument's ability to:
a)
Produce consistent readings under repeated measurements
b)
Detect the smallest change in the input signal
c)
Provide a reading that is close to the true value of the measurand
d)
Maintain a consistent output over time without calibration
9.
For the dataset: 5, 8, 12, 14, 15, 18, 20, what are the mean and median values?
a)
Mean: 13.14, Median: 14
b)
Mean: 13, Median: 14
c)
Mean: 13.14, Median: 12
d)
Mean: 14, Median: 15
10.
A bag contains 4 red, 6 black, and 2 white marbles. What is the probability of randomly drawing: (i) a black marble, (ii) a marble that is not white, and (iii) a red or white marble?
a)
i) 1/2, ii) 5/6, iii) 1/2
b)
i) 1/3, ii) 1/6, iii) 1/3
c)
i) 1/2, ii) 1/2, iii) 5/6
d)
i) 1/2, ii) 1/3, iii) 5/6
11.
A normal distribution of student test scores has a mean of 75 and a standard deviation of 5. According to the empirical rule, what percentage of students scored between 70 and 80?
a)
0.95
b)
0.68
c)
0.997
d)
0.34
12.
The weight of a certain product is normally distributed with a mean of 100 g and a standard deviation of 3 g. What is the probability that a randomly selected product will weigh more than 103 g?
a)
0.8413
b)
0.1587
c)
0.5
d)
0.34
13.
A component's lifespan is normally distributed with a mean of 10,000 hours and a standard deviation of 500 hours. If 1,000 components are tested, approximately how many would be expected to last less than 9,500 hours?
a)
159
b)
500
c)
341
d)
250
14.
The voltage output of a power supply is normally distributed with a mean of 12 V and a standard deviation of 0.5 V. What is the percentage of outputs that would fall between 11 V and 13 V?
a)
0.95
b)
0.815
c)
0.997
d)
0.68
15.
What is the primary reason for performing calibration on an instrument?
a)
To make the instrument easier to use
b)
To confirm its readings are accurate and consistent with a known standard
c)
To increase the speed of the measurement
d)
To reduce the number of measurements needed
16.
Which of the following is most likely to require regular calibration checks due to potential drift over time?
a)
A simple ruler
b)
An analog weighing scale with a mechanical spring
c)
A precision digital thermometer
d)
A measuring tape
17.
According to the notes, which organization is responsible for providing national measurement standards and calibration services in Malaysia?
a)
The Ministry of Science, Technology, and Innovation (MOSTI)
b)
The National Metrology Institute of Malaysia (NMIM) under SIRIM Berhad
c)
The Malaysian Institute of Standards (MIM)
d)
The Ministry of Higher Education (MOHE)
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